Open the multiple page document.
Refer to "Opening Image Files and Documents", for complete information. Save Page as Image is only used for multiple page documents.
Navigate to the page to be saved.
For information on selecting a page, refer to "Viewing Multiple Page Documents".
Select File -> Save Page As Image.
Saving a single page of a multiple page document is exactly like any other type of save. Refer to "Save As" for complete information.